A worm gear drive configuration that uses a cylindrical worm to mesh with a cylindrical helical gear. Cylindrical configurations offer high speed reduction ratios but can be used only with light loads.

A type of helical gear with two sets of teeth cut at opposing angles, separated by a groove that runs around the center of the gear. Double helical gears are used to provide smoother operation and avoid side loads.

A worm gear drive configuration that uses an hourglass-shaped worm with curved teeth to wrap around part of the worm gear. This configuration provides the highest amount of tooth contact and can carry the greatest amount of load.

A type of bevel gear used in pairs with intersecting shafts at 90° angles. Both the driving gear and driven gear in a miter gear pair have the same diameter, same number of teeth, and a mechanical advantage of 1.

A worm gear drive configuration that uses a gear with curved teeth to wrap around part of the worm. This configuration provides more contact between the worm and worm gear teeth and can carry more load.

A type of bevel gear with teeth that are straight and cut at an angle to the axis of the gear shaft. Skew tooth gears can carry more load than straight bevel gears and are generally made in large sizes.

A gear drive consisting of a long, cylindrical device with a spiraling groove that intersects with the teeth of a wheel-like gear. A worm gear drive is used to transmit motion between nonintersecting perpendicular shafts, and the cylindrical "worm" is always the drive gear.